I´m at a turning point .. to change my OS from W7 to Ubuntu.
The thing is: Do I need to make a backup of my files?
Or, can I just install the new OS and my files will ALL be quite safe?
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YES. All your files will be overwritten, by the new installation of Ubuntu.
(First) Backup all your documents, media, settings (email, passwords) to a USB device or external HDD.
Install Ubuntu alongside Windows 7, and see if it works (for you).
(OPTIONAL) (Much Later) You can remove / replace Windows 7 with Ubuntu.