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Tuesday, February 4, 2025

Time Machine on the APFS album makes use of numerous house for famend recordsdata?


I got here throughout Time Machine copy famend recordsdata?Posted about 10 years in the past, and I questioned what the reply for the APFs implementation of Time Machine could be.

The query was: if a file already tracked by Time Machine (HFS+) shall be renamed, does Time Machine merely create a hyperlink with the brand new identify to the earlier file or create a brand new copy, as if the file have been fully totally different? The reply offered there, if I perceive accurately, is that the latter is true and that the identical applies to any small change to a file.

My query: Does the renowing of a (giant) file trigger a corresponding improve in the usage of the disc on the backup disc? Does a distinct folder transfer totally different from the change of identify on this regard? In addition to, what’s a small change in a giant file? (And why?)

I believe that APFS backups work in a totally totally different method from HFS, with the system primarily based on arduous hyperlinks changed by one thing primarily based on APFS snapshots (proper?). As well as, I believe I learn someplace that APFS has the power to “double” a file with out creating an entire copy, and retailer solely variations as one of many duplicates is modified. Then, if I double a ten GB file and partially modify one of many copies, the actual disc house used could be lower than 20 GB (once more, is that this appropriate?). So, I suppose that neither rename/transfer or edit a file makes a totally new copy of that file on the backup disc, however I’m not positive I perceive and even at a primary stage of how APFs and time of Machine work


PS: I’m asking this out of curiosity, I clearly don’t intend to resolve whether or not to alter the identify or edit recordsdata primarily based on the disc house taken in my backup unit. As well as, I do know that Time Machine can eradicate outdated backup copies to launch house, however for this query, suppose the backup album has numerous free house.

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