Sync and copy timestamp

Product Discussions
1

Lets say, I wrote a script to do synchronization between local drivers of my N computers and Storj.

I copy files to storj with command
uplink cp file sj://AAA/BBB

Now I have this situation:

  • File A for local disk of computer C1 with modification timestamp 2020-01-01, copied to storj with timestamp 2022-01-12 (today).
  • File A for local disk of computer C2 with modification timestamp 2021-01-01, copied to storj with timestamp 2022-01-13 (tomorrow) and overwrite previous version.
  • I am trying to sync computer C1 with Storj. How can I determine if file A on Storj is the original from C1 or has been modified, so C1’s file A must be overwritten from file A on Storj? Usually sync algorithms take advantage of size and date but here date is not exist as I expected.

Dirty workaround: keep for each computer the timestamp of last sync. If a file is newer than that timestamp, prevails.

Just for curiosity, is there anything better?

2

In Storj you cant modify written file, only delete old file and write new. So you can have backups from every day of a year for example, just put timestamp to files and make own path to every pc backup.

3

@nickreserved You could keep track of the file’s modification timestamp as metadata attached to the Storj object.

If you use Uplink CLI, this is using the --metadata flag in the cp command.
If you use the Uplink library, this is using the SetCustomMetadata method.

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