Migrating from rsnapshot

Support
#1

If I use duplicacy to back up a drive to backblaze containing rsnapshot backups, will this cause the data volume to explode? And can I expect this to be mitigated by Duplicacy’s deduplication?

From what I understand, rsnapshot uses linux hard links. When the files are moved or copied to an incompatible file system, the hard links break and duplicate files are created. Given there are ~30 snapshots in the backup history, this could create an absurd amount of data to upload.

The rsnapshot backups total 8.5TB on disk. I’d appreciate any insight from the community before I potentially upload 250TB of data to backblaze by accident. Thanks!

#2

As far as I understand, rsnapshot is a front end for rsync.

I don’t think duplicacy will preserve hardlinks, it will treat each instance as separate file, but since content it identicall the data will occupy space only once.

#3

Yeah, it uses cp with hard links to cascade the backups, then rsync to pull the new data.

I guess we’ll see how efficient Duplicacy’s deduplication is when I run this. Fingers crossed!