I'm recommending you use the Samsung Smart Switch utility as a better option than manually backing up your phone data. Smart Switch will give you more comprehensive backups than if you're not familiar with the basic data storage setup of a typical Android device. It not only makes it easier to migrate the user account your old phone to the new one., plus you really, really need to have some kind of thorough backup solution in place. Do periodic backups, they're important. If there's data that only exists on your phone, current backups are vital. Use a microSD card as a supplemental backup media, but keep a primary backup that's on a computer/laptop or within an online storage service. If you lose your phone or it's stolen, all that data is in that phone.
One important aspect is you referred to a Galaxy A25 as a new replacement but what brand and make is your current phone? Note that Smart Switch is primarily for Samsung devices with only limited support for non-Samsung devices -- i.e. it 'might;' work out well for your old, current phone but is a utility you should use on that A25.
And this is just speculation but with a more current phone like A25, its Android OS has become a lot more developed in auto-migrating on older phone to a new one. You might not need to involve installing third-party utilities, you might be prompted to just connect the old phone to the new one via a USB cable or wirelessly, authenticate the process, and just wait for a transfer to complete.
