Re how much disc space needed for TM?

Hi..
I have 2 x 500 gb and 1 x 300 gb storage on my machine. Can I use one of the 500 for time machine for only TM, of both of the others drives... so does it compress?
For instance a 100GB film project needs backing up. If I use time machine how much space will it use. The same? If the project is 1 month long and worked on every day.
Can I then delete it from time machine afterwards. Then clear the whole computer for the next project?

General opinion says TM requires twice the room of the backed up data, so a 100 GB film project would be adequately catered for on your 500 GB external partition.
But consider the nature of TM backup pattern:
every hour for the most recent 24 hrs,
every day for the most recent week,
every week for the most recent month,
So if you saved your project every hour a day for 20 working days a month, there would not be 160 incremental versions, but only
8 saves in the most recent day (business hours)
5 saves at the end of each day of the last week (working week)
3 saves of each of the preceding three weeks of the last month (plus the current week)
So TM does not function like a continuous archive, but is more of a recovery application for the day, the last 7 days, or the last 3 'Fridays' of the last month. Something to think about.
I forgot to answer your last query, yes, a TM backup can be deleted.
Message was edited by: roam

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