Is it easy to move files from a Windows system to Mac? Would a Mac system recognize my emails (currently on Thunderbird) or my internet bookmarks (on Firefox)?
When I connect my iPhone to my Windows laptop, I have limited success drag & dropping files. I can move image files from the iPhone's folder to the Win laptop, but not from the laptop to the iPhone.
And I can't move any sound files I record on the iPhone, because they don't show up on Win Explorer. Only the image files I take with my iPhone camera.
The iCloud app works well for me.
I have the cheapest paid option for iCloud storage, 50 GB for $0.99 monthly. This takes care of storage and backups for two iPhones, an iPad, and a MacBook Pro. It’s awesome for when it’s time to upgrade a phone: activate the phone on your account, and it automatically sets up your new phone using the backup. For long-term storage, I use an external USB drive on my PC.
I installed the iCloud for Windows app on my PC. With it I can download files, pictures, etc. from iCloud storage to my PC, then save them locally on the external drive. Afterwards, I remove the files from iCloud, freeing up storage space. I haven’t tried moving files from PC to MacBook or iPad using iCloud, so can’t offer any insight or advice, other than it’s probably just as easy.