![]() Why not? All the other backup software offers in-place restores. zip from a web UI, or requesting a delivery of a disk. Your only restore options are downloading the data as. Backblaze has no option to 'restore in place'.But I don't like Backblaze's software offering: Backblaze: The Market Leaderīackblaze is the best left after Crashplan exited. But then they shut down their consumer offering, leaving only a too-expensive small business offering. The price point was great and the software mostly just worked. Crashplan: The Good Old DaysĬrashplan used to be good. ![]() Overall, I would weakly recommend it as the best of a bad bunch.īut Arq doesn't run on Linux. And I worry a little that it's closed-source, but I'm reassured by them documenting the storage format. And the UX is a little awkward to find things. It mostly works, although I do worry when I hear about the developer breaking backwards compatibility between versions. It uses a modern, content-addressed storage format. Arq: It's OK Arq screenshot, from my mac.Īrq is decent, and I use it for my Macbook. Spoiler: Ultimately, I use Arq to backup my Macs, and Duplicacy for my Synology Network-Attached-Storage (NAS) device. I'm looking for software that will run on the NAS (Linux, Synology), at a reasonable cost for 1TB of backups, client-side encrypted, maybe with a year's worth of version retention. So, not really backups! Time to re-evaluate cloud backup software. Cloud Sync is not revisioned – only the latest version is kept, so a corrupted source would overwrite the sync. My macbook's backups are all good, having revisioned daily backups on Arq.īut my big files that live only on the Synology NAS (mostly disk images taken from disks inherited from a deceased estate) were only "synced" to Google Cloud Storage, by Synology Cloud Sync. I have data on my macbook, and on my Synology NAS. Step 6 − If the sender doesn’t receive the ACK2 from the receiver within the time slot, it declares timeout for frame 2 and resends the frame 2 again, because it thought the frame2 may be lost or damaged.After my last blogpost, where one of my hard drives was maybe taken out by lightning, I was reminded to reevaluate my backup strategy. Step 5 − whenever the sender receives the ACK1 from the receiver, within the frame 1 timer then it is closed and sent to the next frame, frame 4. Step 4 − Whenever sender receives the ACK0 from receiver, within the frame 0 timer then it is closed and sent to the next frame, frame 3. Step 3 − In the same way frame2 is also sent to the receiver by setting the timer without waiting for previous acknowledgement. Step 2 − Without waiting for acknowledgement from the receiver another frame, Frame1 is sent by sender by setting the timer for it. Step 1 − Frame 0 sends from sender to receiver and set timer. Given below is an example of the Selective Repeat ARQ − The sender will send/retransmit a packet for which NACK is received. The receiver while keeping track of sequence numbers buffers the frames in memory and sends NACK for only frames which are missing or damaged. In Selective Repeat ARQ only the lost or error frames are retransmitted, whereas correct frames are received and buffered. In selective repeat protocol, the retransmitted frame is received out of sequence. In the selective repeat, the sender sends several frames specified by a window size even without the need to wait for individual acknowledgement from the receiver as in Go-Back-N ARQ. It is also known as Sliding Window Protocol and used for error detection and control in the data link layer. Let us see the working condition of Selective Repeat ARQ. ![]() If an ACK of data-frame previously transmitted does not arrive before the timeout, the sender retransmits the frame, thinking that the frame or it’s ACK is lost in transit Retransmission − The sender always maintains a clock and sets a timeout period. Negative ACK − Whenever the receiver receives a damaged frame or a duplicate frame, it sends a NACK back to the sender and sender must retransmit the correct frame. Positive ACK − Whenever a receiver receives a correct frame, it should acknowledge it. There are some requirements for error control mechanisms and they are as follows −Įrror detection − The sender and receiver, or any must ascertain that there is some error in the transit. Generally, there are three types of techniques which control the errors by Automatic Repeat Request (ARQ) they are − Selective-repeat Automatic Repeat Request (ARQ) is one of the techniques where a data link layer may deploy to control errors.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |