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I have beginner questions about wallets, security, and obtaining bitcoins.

I did a some research a while ago and basically became overwhelmed but now I'm back and ready to learn. I downloaded a wallet program, Bitcoin-Qt.
Question 1: Is my hard drive going to fill up from all these updates it downloads?
I tried mining with my old PC but I never mined enough to get paid and 3 straight weeks of mining kinda screwed up my old GPU. So then I tried faucets. I made a "receive" address and named it "bitchest.me" and I entered enough captchas to get 0.00006941 BTC. Hooray! I finally have bitcoins in my wallet!
Question 2: My 0.00006941 BTC is mine forever, right? Bitchest.me can't take that back, right?
So now that I'm filthy rich, how do I make the wallet safe? I have options to encrypt the wallet and to back it up.
Question 3: Does it matter what order I do this in, either encrypting or backing up first?
Question 4: If I backup my wallet, and then earn more bitcoins, and then my hard drive dies and I recover my wallet from my backup, will I still have the bitcoins I earned since the backup?
I appreciate any help or advice you can offer. Some of the "beginner" guides I've looked at have made me feel like an idiot because I'm still having trouble grasping this technology. Also, when I have $10 or $20 to blow I would like to buy some bitcoins. I don't know anyone personally who has bitcoins so I would need to use my debit card and buy some online. Elsewhere in this subbreddit purse.io was mentioned.
Question 5: Can I trust purse.io? Is there a better way to buy bitcoins?
Thanks for reading this and (hopefully) responding!
submitted by LiberalDutch to BitcoinBeginners [link] [comments]

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Dash: QT Wallet Encryption = G15E12

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