Hi,
LTO-4 are supposed to store 800GB uncompressed. That's the only value
you can expect from the tape.
Depending on the data pieces you want to backup, you can have a ratio
lower than 2. If data pieces are already compressed you won't have a
good compression ratio.
Is the capacity dynamic, i.e. decreases with the number of writes as
tapes age and wear down?
It could make sense as the tape from February was put in service in
2014 and the one from July in 2011.
According to Wikipedia, a tape could last up to 30 years and 20000
mounts/unmounts.
You will be able to identify tapes when they will generate read / writes
issues in a clean drive.
HTH.
Jérôme Blion.
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