Re:Show HN: Bvckup 2 – Fast File Replicator for Windows
by apankrat on Monday July 08, 2019 @04:27PM
(#20386434)
I am not familiar with nasuni, but the general idea is that once bvckup2 has the block hashes for the source file, it will write only modified blocks to the backup copy.
Block hashes are computed either when the file is first copied to destination (by bvckup2) OR when the exact copy already exists at destination and the backup job is set to do "delta pre-comp" [1].
If in your case the latter applies, you may in fact get away with setting up delta copying without pulling any data off the cloud storage.
If my destination doesnt actually have a copy of the data, but only the metadata (onedrive sync with filespace freed up, nasuni with files purged from the cache) can bvckup write only the changed blocks, or for example, would the nasuni need to pull the file from the cloud master back into the cache before it can patch it with the delta? Maybe this is such a tech specific question it doesnt have an answer.