Providing your data is not corrupted compression is not an issue.
Its been a very long time since ive studied compression😳 but from what i understand from classes ( over a half century ago)!
So this might not be accurate.
Early compression was removing all spaces, tabs, and indents, and paragraphs.
Leaving a number representing what it was.
Translation to machine code, then to binary for storage by the compression software.
This 3 step process dramatically reduced the size of the file.
But like i said earlier, it might not be accurate because im an old fart🤣
Numerous shareware utilities ( pkzip, / pkunzip, 7 zip, etc) were available for this.
But many os’s come with their own backup programs that give you the option of file compression.
The problem with backing up large amounts of data is that media size is a problem.
Things to consider:
What is the importance of the data?
What will the cost of storage be?
And what will the long term reliability of the storage media be?
Optical media such as blueray for long term storage,
pros:
much lower costs highly reliable, and relatively immune to magnetic corruption, searchable, and much higher speed.
In controlled temperature environments they can last centuries.
Cons:
Easily damaged by excessive heat, excessive sunlight, dirt scratches and being fragile in excessive cold.
And limit in size.
Tape drives
Pros: larger storage capacity due to recording procedure, and the size( length) of the tape
Cons: susceptibility to magnetic fields, fragility of the media, ( heat, cold, wearing, stretching, tearing, wrinkling, etc)
Slow speed.
Excessive cost for media, and drives.
Maintenance expenses.
And lastly the magnetic fields of the recorded data itself will fade over time if not refreshed periodically.
The major conundrum here is, technology is rapidly outpacing the storage capabilities.
Look at how cdr and dvd are faring right now as compared to just 10 years ago.
Sure the dvd may last a long time ( 100 plus years)in storage
But will the drives be around that long?
Thats too far into the future for me to see.